Method of surveying roadway loosening and stress concentration ranges based on drilling parameters

A technology of stress concentration and drilling parameters, which is applied in the direction of earthwork drilling, mining equipment, mining equipment, etc., can solve the problems of blindness in the effective sealing distance and lack of effective detection of roadways, etc., to improve pertinence and save costs The effect of maintenance costs

Inactive Publication Date: 2015-08-12
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] For a long time, there has been a lack of technical methods to effectively detect the loose area and stress concentration area on both sides of th...

Method used

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  • Method of surveying roadway loosening and stress concentration ranges based on drilling parameters

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Embodiment 1

[0015] Embodiment 1: the method constructs long boreholes along the bedding in the mine coal or rock roadway, records and calculates the thrust, rotating speed, torque and penetration rate in the drilling process, and utilizes the drilling parameters and drilling parameters of the coal and rock mass drilling rig. The hole parameters are used to calculate the energy consumed by drilling a unit rock mass, that is, the drilling specific energy, and the corresponding relationship between the drilling specific energy and the drilling distance is obtained. It is related to the different physical and mechanical properties of the coal-rock roadway under different physical and mechanical characteristics, so as to infer the stress concentration and loosening area on both sides of the coal-rock roadway. Calculate the lateral stress concentration and loose area range.

[0016] Further, under the condition of constant thrust and rotational speed, the penetration rate can be used to charact...

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Abstract

The invention discloses a method of surveying roadway loosening and stress concentration ranges based on drilling parameters, which belongs to surveying of deep formation drilling ground stress concentration areas. The method comprises steps: construction of drilling long boreholes down a seam is carried out in mine coal or a rock roadway, a thrust, a rotation speed, a torque, and a drilling speed during the drilling process are recorded and calculated, drilling parameters are used for calculating energy consumed by drilling a unit rock, drilling specific energy is thus acquired, the corresponding relationship between the drilling specific energy and a drilling distance is acquired, certain response features exist between energy consumed when a coal-rock mass of the same kind is drilled and different physical and mechanical features shown by the coal-rock mass in different ground stress conditions, stress concentration and loosening area ranges at two sides of the coal-rock roadway are calculated, and a drilling speed variation trend with the constant thrust and the rotation speed is used for calculating the stress concentration and loosening area ranges at two sides of the coal-rock roadway. The method of the invention has the advantages that the supporting efficiency of the roadway is improved, the maintenance cost of the roadway is saved, guidance is provided for an effective hole sealing distance of gas pressure relief drainage and drilling, and drainage effectiveness of the gas is improved.

Description

technical field [0001] The invention relates to an inspection of the range of a stress concentration area for deep formation drilling, in particular to a method for inspecting roadway looseness and stress concentration range based on drilling parameters. Background technique [0002] The geological conditions of my country's coal mines are complex, the coal seam has low permeability and high gas pressure, and it extends to the deep year by year. The high ground stress and gas pressure in the deep make the coal-rock dynamic and gas disasters such as rock burst and mine earthquake more serious, which has a great impact on roadway support and gas pressure. Technologies such as prevention and control have put forward higher requirements. Coal-measure strata are mostly soft-medium-hard sedimentary rocks, mainly sandstone, shale, mudstone, conglomerate, and coal. Their strength, deformation characteristics, and failure mechanisms are closely related to the state of in-situ stress. ...

Claims

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Application Information

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IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 王伟程远平武国胜王晓平李伟赵伟秦立明
Owner CHINA UNIV OF MINING & TECH
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